Shounen Manga Recommendations

http://www.mangago.me/read-manga/the_hero_who_seeks_revenge_shall_exterminate_with_darkness/

Thanks! I've already read this one, but I have to agree that the mc is the most insane psycho out there!

http://www.mangago.me/read-manga/dendrobates/ ヾ(☆▽☆)

My god this manga looks so good! It gives me Funouhan vibes! tytytyty
I'm going to go read this ASAP ε=ε=(ノ≧∇≦)ノ

Yay! ٩(๑❛ᴗ❛๑)۶ I'm glad you're looking forward to it! I hope you like it! For a simple badass fighter type character, I also liked Boss in School http://www.mangago.me/read-manga/boss_in_school/

Also, for characters who are killers, hmm, I started a list on my page that includes some of the things I've read that fit that characterization (I tried to keep it to MCs who are killers). You made me realize I've read a lot of these types of stories (but am mostly left disappointed). Still, they may prove to be a good jumping off point. I hope it helps!
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http://www.mangago.me/home/mangalist/581307/

Nice list! Dendrobates is awesome so far. Also, I love how you included An Uncomfortable Truth at the end. The entire time I was reading that webtoon, I thought it was yaoi :/
Anyways, it's hard being a really really picky reader. For me, I only like when the guy (mc) is a bad*ass serial killer who works alone and has the police scrambling.
From what I can see in your list, you should try Gorgon: http://www.mangago.me/read-manga/gorgon/. I dropped this one since even though the mc had the power to kill everyone, he was too wimpy and too much of a hero for me. Also the antagonist was a killer too.
And if you want to take a break from all the killing, but still want to read about a bad*ss mc, try Zennou no Noa and Void.
Here are some psychological mangas about killers (from what I can tell, haven't tried reading these because I'm picky :D):
Destroy and Revolution: http://www.mangago.me/read-manga/destroy_and_revolution/
Terror Man: http://www.mangago.me/read-manga/terror_man/ (IDK if he actually kills, but he's a terrorist so...)

Ugh, I'm also picky. I have suuuuuccchhhh a soft spot for OP characters LOL. And yeah, the reason why I like Dendrobates so much is because he works alone and keeps EVERYONE scrambling! Love him so much.

In both stories and real life, I loathe wimps, whiners, emotional weaklings, and the action stunted. Pain is pain and all that (it's hard for everyone), but at the same time, if a person stays under such a thing and attaches themselves to a victim mentality, then it's nigh impossible to get over the pain.

I also felt like The Uncomfortable Truth was totes a yaoi lol! It was an odd back and forth; in the end, I decided that it was practically within the LGBT spectrum (in an unhealthy way lol)...after all, romantic love doesn't have to be sexual :)

Thank you very much for the recs! I'll check them out. Currently, I'm reading Akumetsu, which you also recommended (^_^) I'd started Terror Man at one point...but he was angsty for no real reason, inflexible, whiney, emotionally passive/avoidant, and all too annoying lol. I also started Jagaaaaaan last night...I still don't know what I think.